| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * VC-1 demuxer | ||
| 3 | * Copyright (c) 2015 Carl Eugen Hoyos | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "avformat.h" | ||
| 23 | #include "rawdec.h" | ||
| 24 | #include "libavutil/intreadwrite.h" | ||
| 25 | #include "libavcodec/vc1_common.h" | ||
| 26 | |||
| 27 | 7186 | static int vc1_probe(const AVProbeData *p) | |
| 28 | { | ||
| 29 | 7186 | int seq = 0, entry = 0, invalid = 0, frame = 0, i; | |
| 30 | |||
| 31 |
2/2✓ Branch 0 taken 375671081 times.
✓ Branch 1 taken 7186 times.
|
375678267 | for (i = 0; i < p->buf_size + 5; i++) { |
| 32 | 375671081 | uint32_t code = AV_RB32(p->buf + i); | |
| 33 |
2/2✓ Branch 0 taken 31823 times.
✓ Branch 1 taken 375639258 times.
|
375671081 | if ((code & 0xffffffe0) == 0x100) { |
| 34 | 31823 | int type = code & 0x11f; | |
| 35 | 31823 | i += 4; | |
| 36 |
4/4✓ Branch 0 taken 455 times.
✓ Branch 1 taken 531 times.
✓ Branch 2 taken 1432 times.
✓ Branch 3 taken 29405 times.
|
31823 | switch (type) { |
| 37 | 455 | case VC1_CODE_SEQHDR: { | |
| 38 | int profile, level, chromaformat; | ||
| 39 | 455 | profile = (p->buf[i] & 0xc0) >> 6; | |
| 40 |
2/2✓ Branch 0 taken 406 times.
✓ Branch 1 taken 49 times.
|
455 | if (profile != PROFILE_ADVANCED) { |
| 41 | 406 | seq = 0; | |
| 42 | 406 | invalid++; | |
| 43 | 406 | continue; | |
| 44 | } | ||
| 45 | 49 | level = (p->buf[i] & 0x38) >> 3; | |
| 46 |
2/2✓ Branch 0 taken 16 times.
✓ Branch 1 taken 33 times.
|
49 | if (level >= 5) { |
| 47 | 16 | seq = 0; | |
| 48 | 16 | invalid++; | |
| 49 | 16 | continue; | |
| 50 | } | ||
| 51 | 33 | chromaformat = (p->buf[i] & 0x6) >> 1; | |
| 52 |
2/2✓ Branch 0 taken 2 times.
✓ Branch 1 taken 31 times.
|
33 | if (chromaformat != 1) { |
| 53 | 2 | seq = 0; | |
| 54 | 2 | invalid++; | |
| 55 | 2 | continue; | |
| 56 | } | ||
| 57 | 31 | seq++; | |
| 58 | 31 | i += 6; | |
| 59 | 31 | break; | |
| 60 | } | ||
| 61 | 531 | case VC1_CODE_ENTRYPOINT: | |
| 62 |
2/2✓ Branch 0 taken 480 times.
✓ Branch 1 taken 51 times.
|
531 | if (!seq) { |
| 63 | 480 | invalid++; | |
| 64 | 480 | continue; | |
| 65 | } | ||
| 66 | 51 | entry++; | |
| 67 | 51 | i += 2; | |
| 68 | 51 | break; | |
| 69 | 1432 | case VC1_CODE_FRAME: | |
| 70 | case VC1_CODE_FIELD: | ||
| 71 | case VC1_CODE_SLICE: | ||
| 72 |
3/4✓ Branch 0 taken 39 times.
✓ Branch 1 taken 1393 times.
✓ Branch 2 taken 39 times.
✗ Branch 3 not taken.
|
1432 | if (seq && entry) |
| 73 | 39 | frame++; | |
| 74 | 1432 | break; | |
| 75 | } | ||
| 76 | } | ||
| 77 | } | ||
| 78 | |||
| 79 |
3/4✓ Branch 0 taken 6 times.
✓ Branch 1 taken 7180 times.
✓ Branch 2 taken 6 times.
✗ Branch 3 not taken.
|
7186 | if (frame > 1 && frame >> 1 > invalid) |
| 80 | 6 | return AVPROBE_SCORE_EXTENSION / 2 + 1; | |
| 81 |
2/2✓ Branch 0 taken 23 times.
✓ Branch 1 taken 7157 times.
|
7180 | if (frame >= 1) |
| 82 | 23 | return AVPROBE_SCORE_EXTENSION / 4; | |
| 83 | 7157 | return 0; | |
| 84 | } | ||
| 85 | |||
| 86 | FF_DEF_RAWVIDEO_DEMUXER2(vc1, "raw VC-1", vc1_probe, "vc1", AV_CODEC_ID_VC1, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS) | ||
| 87 |